real-world machine learning: how kinect gesture - alisson sol
Post on 12-Feb-2022
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A Few Useful Things to Know about Machine Learning
https://www.coursera.org/course/machlearning
https://www.coursera.org/course/ml
ZIP Beds Baths Sq ft Built Lot Update Value
98052 4 3 2,200 1968 10,000 - 400,000
98004 4 3 2,100 1968 10,000 - 500,000
98004 5 3 2,400 1970 9,000 2005 600,000
98008 4 2.5 2,200 1980 5,000 - 500,000
… … … … … … … …
98052 4 2 2,200 1990 7,000 - ???
Dev verification x QA validation
Source: book Machine Learning in Action
Survive underwater? Has flippers? Fish?
Y Y Y
Y Y Y
Y N N
N Y N
N Y N
Under? Flipper? Fish? Prob. Log2(Prob.) Entropy Y Y Y
0.4 -1.32 0.53 Y Y Y Y N N
0.6 -0.74 0.44 N Y N N Y N
0.97
?
Under? Flipper? Fish? P. Log2(P.) Entropy
Y Y Y 0.5 -1.00 0.50
Y Y Y
N Y N 0.5 -1.00 0.50
N Y N
1.00
Under? Flipper? Fish? P. Log2(P.) Entropy
Y N N 1 0.00 0.00
H(Flippers?) = H(Y)*4/5 + H(N)*1/5 = 1.0*4/5 + 0*1/5 = 0.8
?
Under? Flipper? Fish? P. Log2(P.) H
Y Y Y 0.67 -0.58 0.39
Y Y Y
Y N N 0.33 -1.58 0.53
0.92
Under? Flipper? Fish? P. Log2(P.) Entropy
N Y N 1 0.00 0.00
N Y N
H(Underwater?) = H(Y)*3/5 + H(N)*2/5 = 0.92*3/5 + 0*2/5 = 0.552
Team 1 Team 2
Nurse Nurse
Surgeon Surgeon
Assistant surgeon Assistant surgeon
Surgeon Cardiologist
Surgeon Perfusionist
Surgeon Anesthesiologist
Nurse Scrub tech
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